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Date: 2011jun25
OS: Windows

Q.  How does windows check if I have a good internet connection?

A.  Its NCSI (Network Connectivity Status Indicator) checks that:

dns.msftncsi.com resolves to 131.107.255.255 using DNS http://www.msftncsi.com/ncsi.txt contains exactly: Microsoft NCSI with no newlines or other non-printing characters.
More info http://technet.microsoft.com/en-us/library/cc766017%28WS.10%29.aspx

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